The GM LWN Duramax is a turbo-diesel engine produced by General Motors for use in mid-size pickup trucks and SUVs. Itâs also worth noting in 2018 a class-action lawsuit was filed against GM, Ford and Bosch for the early failures of the CP4 pump, however, it appears the case was dismissed for a bunch of legal reasons containing the phrase âdenied as mootâ. At $100 bucks for the filter change itâll take a lot of filters to equal the cost of a fuel system. Duramax LB7 Problems when Tuned / Running High Horsepower Since the LB7 is a bit behind the performance curve compared to more modern diesel engines, performance modifications are common. Very informative for those like me, who have heard of the CP4 failure but have no experience dealing with or preventing it! Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated … A well maintained and taken care of truck will undoubtedly last as you’re proving. There are a few ways you can get into trouble however, but thatâs usually a case of self-inflicted harm from being a bit too eager with the power upgrades. SHAME ON YOU GM !! The issues with the LML fuel system are now rearing their ugly heads and showing just how much it costs to repair. Texas Law Office has a active lawsuit against GM over this Deceptive and just shady acts GM has done to there customers by knowingly selling this bomb P.O.S. Because the previous owner deleted the emissions means they have some type of tuning, so see if they’ll tell you what kind of power levels they were running it on to gauge if the truck has been abused. Otherwise, there are things that can help, such as a CP3 conversion to eliminate the CP4 and upgrading the lift pump, but in terms of something from the dealer and them recognizing the issues, you’re exactly right. It is is great shape and the new dealer has put some work into it to get it ready to sell….I know no one can tell if something will break, but it seems to have well loved early at least. While there were several other mechanical upgrades to the internals of the engine like stronger pistons and rods, the biggest difference between the LML and all earlier engines was in the fuel system, which now centered around a Bosch CP4.2 injection pump and new piezoelectric injectors which operated at a much higher pressure than earlier models, topping out near 29,000psi. Unfortunately, we’re unaware of any recourse once you’re beyond warranty coverage. That all sounds great on paper, but in the real world, things werenât so simple. Previous model years of Duramax would still have the tried and true CP3 where Fords had various models of an HPFP, not a traditional CP3. Because of the physical properties of diesel fuel, it loves to collect water and other contaminants, neither of which are very good at lubricating metal. I searching for GM or Ford Diesel truck in the 2006 – 2011 range. Regardless…not knowing how this works…if mechanic was to replace all injectors, head, and return lines, am I basically getting a reset on the life of this truck? The newest Bosch pump was very different from the earlier CP3; it features two piston pumping elements instead of one and each has its own camshaft lobe; itâs basically a V-twin injection pump. Itâs time for some real talk: the purpose of this article is not to scare you into selling your CP4 powered truck or to stop you from buying one in the first place. Duramax LB7, Duramax LLY, Duramax 06 LLY / 06+ LBZ & LMM, Duramax 2011+ LML / LGH, Cummins 5.9L, Cummins 6.7L, Cummins HD, Allison 5 & 6 Speed, E98 2014+ Diesel ECM, E47 LUZ 2.0L (Family-B) Diesel, E20 LNP 2.0L & 2.2L (Family-Z) Diesel Average repair cost is $3,450 at 106,450 miles. We typically hear of injector and/or pump failures occurring more in the 120k+ range. That sounds like an inconvenience, but those metal shavings arenât just recirculating in the injection pump. However, once you looked a bit deeper, it became readily apparent the two trucks were nothing alike. The LML connecting rods are made from forged steel, have roughly the same strength as earlier rods and are a few grams lighter. Instead, youâll first want to consider a turbo with a much less restrictive exhaust housing and taller vanes, like the Duramax Tuner Stealth 64. Hopefully they do. the guy that is selling it says it was deleted before he got it (he bought it with 120,000 miles. Needs $8-10k. The trucks sported a new larger wheel bolt-pattern of 8x180mm, the Allison transmission got several updates to make it hold more power and shift crisper and of course you canât forget about the all new powerplant, the LML Duramax. However, i left a 1 star review and they said ownership will contact me. Anyways, I reached out and they said tough luck. But then you still have the issue of the suspension, not sure what’s going on there, but there’s numerous items that can be upgraded in that arena, as well, including something as simple as the addition of a steering stabilizer, something that GM completely overlooked on this truck. Great read and learned quite a bit, I for one am dealing with the LML failure right now, but it wasnât the CP4.2. Read more to discover the problems and solutions of this transmission. No doubt in my mind after driving cummins, powerstroke and duramax Iâll still own a duramax. Failure of this CP4 pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates. Itâs a real thingâ¦). Which Duramax 6.6L Engine is Best? Honestly, even with all the emissions components intact, the LML will be reliable for many years and miles to come. 2011 was a big year for GM as there were a lot of major changes made to its HD truck line-up, but the crazy thing was, from the outside you really couldnât tell. JUST MAKE THIS RIGHT!!!! One thing you might not know, is the CP4 has a built-in power disadvantage to the CP3 with its lower fuel volume, so one popular move is to swap it out with a CP3. In other words, your entire fuel system will be filled with metal shavings, your injectors will be toast and you arenât going anywhere. That said, ANY truck with that amount of mileage will have certain things start to pop up that will need to be addressed. I’m wondering if I need to just bite the bullet and fix or trade in to a dealer even if it means losing $7-10k off what I spent on the truck. This would be a great upgrade from stock in terms of horsepower and reliability and the 64mm charger will still drive like a stock turbo. Most of the major body parts on the Silverado and Sierra were un-changed and only minor details would set a 2010 apart from a 2011. I know itâs convenient GM builds in a fuel filter reminder which pops up on the dash when the computer calculates your filter is dirty, but rather than waiting for a computer to tell you, why not just go ahead and change it every 10,000 miles like a normal person? And when you’re ready, we’ve got kits that can fix your system if the need ever arises. My 2016 dmax have 72 200 kilometres and 3 times cp4.2 faillures .. but on warranty .. but why they keep installing that shitty cp4.2 and tell me that cp3 or lift pump will void my warranty … so stupid……. But now you got me thinking about the cp4… lol. If despite all your best efforts you still have a CP4 wipeout, youâll have to do some shopping. Further, if you do plan on using any of the higher power levels, it will be in your best interest to install a lift pump, such as a FASS Titanium Signature Series and a cold air intake if one hasn’t been installed. Tommy Temple. The worst part about a CP4 failure is how little (if any) warning you get. Thanks for such an easy set up!" Chevy Service Stabilitrak & Traction Control Lights, The 4 Most Common Duramax LML Engine Problems, Duramax P2563 Engine Code: Vane Position Sensor, P0449 Engine Code – Diagnosis & Troubleshooting, Chevy P1345 Engine Code: Diagnosis & Repair. If your fuel system hasnât been maintained with regular filter changes or you get a bad batch of fuel, there can be a small amount of trash or debris that winds up in the CP4 pump, which can be just as dangerous as Luke Skywalker is to the Death Star. Youâre never going to damage your engine by changing the fuel filter too often, but not changing it enough definitely has its risks. Does this sound reasonable, given the high expense of a failure? The FASS Titanium Signature Series lift pump will remove dirt, water, air and debris from your fuel and sends 8-10 psi of fuel up to the engine. The 2011 Dodge Ram 1500 has 37 problems reported for lifter and cam issue. Your email address will not be published.
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